diff --git a/pyproject.toml b/pyproject.toml
index eb8df9f..31f986e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "adif-mcp"
-version = "1.0.3"
+version = "1.0.4"
 description = "ADIF MCP server — spec parsing, validation, and field enumeration tools"
 readme = "README.md"
 license = { text = "GPL-3.0-or-later" }
diff --git a/src/adif_mcp/mcp/server.py b/src/adif_mcp/mcp/server.py
index 0f1c241..d1fd088 100644
--- a/src/adif_mcp/mcp/server.py
+++ b/src/adif_mcp/mcp/server.py
@@ -497,13 +497,15 @@ def calculate_heading(start: str, end: str) -> float:
 
 @mcp.tool()
 async def parse_adif(
-    file_path: str, start_at: int = 1, limit: int = 20
+    file_path: str, start_at: int | None = 1, limit: int | None = 20
 ) -> List[types.TextContent]:
     """Streaming parser for large ADIF files with record seeking.
 
     SECURITY NOTE: This tool reads files from the local filesystem using
     the provided path. Only pass paths to ADIF log files you own.
     """
+    start_at = start_at if start_at is not None else 1
+    limit = limit if limit is not None else 20
     record_pattern = re.compile(r"(.*?)<EOR>", re.IGNORECASE | re.DOTALL)
 
     try: